Resonant acoustic-mixing technology as a novel method for production of negative-temperature coefficient thermistors

Price, Berat Yüksel; Kennedy, Stuart

doi:10.1007/s10854-022-08110-2

Cited by 4 publications

(2 citation statements)

References 29 publications

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“…The addition of the right amount of LAG, is critical for reaching an optimal rheology and conversion of substrates ( η ‐sweet spot) [4] . Furthermore, we extend this concept of medium‐free milling to a resonant acoustic mixer (RAM), which currently emerges as a promising technology for mechanochemistry (co‐crystallization, [5] functional materials, [6] nanoparticles, [7] MOF‐synthesis, [8] and catalytic reactions [9] ) because it enables rapid and efficient mixing [9b,10] . RAM intrinsically avoids the use of grinding media, and so the problem of product contamination due to grinding medium abrasion [5c,9b] and provides a better scalability compared to classical ball mills.…”

Section: Introductionmentioning

confidence: 99%

Milling Medium‐Free Suzuki Coupling by Direct Mechanocatalysis: From Mixer Mills to Resonant Acoustic Mixers**

Wohlgemuth,

Schmidt,

Mayer

et al. 2023

Chemistry A European J

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Here we describe the development of a sustainable and cost‐effective approach for catalytic cross‐coupling reactions in mechanochemistry. It is found that the substrate's impact with the vessel wall alone is sufficient to initiate the reaction, indicating that milling balls function primarily as a mixing agent for the direct mechanocatalytic Suzuki coupling. The absence of milling balls can be offset by adjusting the rheology using liquid‐assisted grinding (LAG). The LAG‐sweet spot of 0.25 μl/mg is confirmed for both resonance acoustic mixer (RAM) and ball‐free mixer mills and is higher than in the presence of milling balls. The RAM exhibits excellent performance in the Suzuki reaction, achieving yields of 90% after 60 minutes and complete conversion after 90 minutes. The longevity of the milling vessel is significantly improved in the RAM, allowing for at least 20 reactions without deterioration.

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Section: Introductionmentioning

confidence: 99%

Milling Medium‐Free Suzuki Coupling by Direct Mechanocatalysis: From Mixer Mills to Resonant Acoustic Mixers**

Wohlgemuth,

Schmidt,

Mayer

et al. 2023

Chemistry A European J

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show abstract

“…The addition of the right amount of LAG, is critical for reaching an rheology and conversion of substrates (η-sweet spot). [10] Furthermore, we extend this concept of media-free milling to a resonant acoustic mixer (RAM), which currently emerges as a promising technology for mechanochemistry (co-crystallization [11,12] , functional materials [13] , nanoparticles [14] , MOF-synthesis [15] , and catalytic reactions [16,17] ) because it enables rapid and efficient mixing. [17,18] RAM intrinsically avoids the use of grinding media, and so the problem of product contamination due to grinding media abrasion [12,17] and provides a better scalability compared to classical ball mills.…”

Section: Introductionmentioning

confidence: 99%

Direct Mechanocatalysis without Milling Media – From Mixer Mills to Resonant Accoustic Mixers

Wohlgemuth

Schmidt

Mayer

et al. 2023

Preprint

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Here we describe the development of a sustainable and cost-effective approach for catalytic cross-coupling reactions in mechanochemistry. It is found that the substrate's impact with the vessel wall alone is sufficient to initiate the reaction, indicating that milling balls primarily serve as mixing agents rather than energy carriers. The absence of milling balls can be offset by adjusting the rheology using liquid-assisted grinding (LAG). The η-sweet spot of 0.25 μl/mg is confirmed for both resonance acoustic mixer (RAM) and ball-free mixer mills and is higher than in the presence of milling balls. The RAM exhibits excellent performance in the Suzuki reaction, achieving yields of 90% after 60 minutes and complete conversion after 90 minutes. The longevity of the milling vessel is significantly improved in the RAM, allowing for at least 20 reactions without deterioration.

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Mechanical response characteristics of HMX crystals under resonant acoustic mixing

Wang,

Yao,

Guo

et al. 2024

Propellants Explo Pyrotec

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Understanding the mechanical response characteristics and determining the optimized process conditions is critical to mitigate crystal impacts during resonant acoustic mixing (RAM). Therefore, high‐melting explosive (HMX) crystal collisions with container walls under different RAM accelerations were investigated through simulations and experiments. The HMX crystal damages after RAM were assessed using microscopic imaging, small‐angle X‐ray scattering, and Brunauer–Emmett–Teller tests. Results show that crystal fractures observed in steel containers can be prevented by using low‐modulus polytetrafluoroethylene containers. Rough containers reduce internal damage but increase surface abrasion. Lower RAM accelerations, shorter RAM durations, and low‐modulus containers can mitigate HMX crystal damage.

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Resonant acoustic-mixing technology as a novel method for production of negative-temperature coefficient thermistors

Cited by 4 publications

References 29 publications

Milling Medium‐Free Suzuki Coupling by Direct Mechanocatalysis: From Mixer Mills to Resonant Acoustic Mixers**

Milling Medium‐Free Suzuki Coupling by Direct Mechanocatalysis: From Mixer Mills to Resonant Acoustic Mixers**

Direct Mechanocatalysis without Milling Media – From Mixer Mills to Resonant Accoustic Mixers

Mechanical response characteristics of HMX crystals under resonant acoustic mixing

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